/**
 * Created with IntelliJ IDEA.
 * Description: 计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
 * Author:  LiuTao
 * Version: 1.0
 * Date:    2023-07-30  16:16
 */
public class Test4 {
    public static void main(String[] args) {
        double sum = 0;
        int flg = 1;
        for (int i = 1; i <= 100; i++) {
            sum += 1.0/i*flg;
            flg = -flg;
        }
        System.out.println(sum);
    }
}
